QuestionThermodynamics / ΔH and ΔU
For N₂(g) + 3H₂(g) ⇋ 2 NH₃(g), the expression for ∆H is:
- (a) ∆U + 2 RT
- (b) ∆U + RT
- (c) ∆U – 2 RT
- (d) ∆U – RT
Answer: (c) ∆U – 2 RT
ΔH = ΔU + Δn(g)RT. Δn(g) = 2 − (1 + 3) = −2 → ΔH = ΔU − 2RT → (c).
UPSC Combined Geo-Scientist
Chemist
- 2 objective papers
- 120 questions each
- 2 h per paper
- 100 + 300 marks
Prelims Paper II covers chemistry.
UPSC Combined Geo-Scientist, Prelims · 2020 · Paper II, Chemistry · Q54 of 120
Geo-Scientist Prelims 2020 Chemistry Q54: For N₂(g) + 3H₂(g) ⇋ 2 NH₃(g), the expression for ∆H is:
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